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  <div class="section" id="datasets">
<span id="datasets-index"></span><h1>Datasets<a class="headerlink" href="#datasets" title="Permalink to this headline">🔗</a></h1>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="overview.html"> Overview</a></li>
<li class="toctree-l1"><a class="reference internal" href="table.html"> Table API</a></li>
<li class="toctree-l1"><a class="reference internal" href="fileset.html"> FileSets</a></li>
<li class="toctree-l1"><a class="reference internal" href="partitioned-fileset.html"> Partitioned FileSets</a></li>
<li class="toctree-l1"><a class="reference internal" href="time-partitioned-fileset.html"> TimePartitioned FileSets</a></li>
<li class="toctree-l1"><a class="reference internal" href="system-custom.html"> System and Custom Datasets</a></li>
<li class="toctree-l1"><a class="reference internal" href="permissions.html"> Dataset Permissions</a></li>
<li class="toctree-l1"><a class="reference internal" href="cube.html"> Cube Dataset</a></li>
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<p><em>Datasets</em> store and retrieve data. Datasets are your means of reading
from and writing to the CDAP’s storage capabilities. Instead of
forcing you to manipulate data with low-level APIs, datasets provide
higher-level abstractions and generic, reusable implementations of
common data patterns.</p>
<p class="rubric">Impersonation</p>
<p>Impersonation allows users to run programs and access datasets, streams, and other
resources as pre-configured users (a <em>principal</em>). Currently, CDAP supports configuring
impersonation at a namespace and at an application level, with application level
configuration having a higher precedence than namespace level.</p>
<p>If impersonation is enabled, and you don’t specify a principal for an application, stream,
or dataset, then the namespace owner’s principal is used. If there is no namespace owner
or you are using the default namespace, then the default principal is used (as set by the
properties <code class="docutils literal notranslate"><span class="pre">cdap.master.kerberos.keytab</span></code> and <code class="docutils literal notranslate"><span class="pre">cdap.master.kerberos.principal</span></code> in the
<code class="docutils literal notranslate"><span class="pre">cdap-site.xml</span></code>).</p>
<p>Details on the system configurations required are in the 管理手册’s section
on <span class="xref std std-ref">admin-impersonation</span>.</p>
</div>

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